The conversion bit, is simple really. PS3 version of angry birds is SD conversion where as HD version should be coming later the year.

Re-newing license issue on the other hand is a bit more tricky. But until someone comes up with public keys and tools to remove npdrm protections and license requirements, essentially full games won't be any good unless theres' available a debug patch package somewhere on PSN network.

The links posted are tested and they do work, but we have not yet found a method to renew the license of a PSX Game for the PS3 via the PSN Store. Its not like the IPod with Cydia and Installous, although there is a PSX store being made for the Jailbreakers.